KR20010087324A - Electric line - Google Patents

Abstract

PURPOSE: An electric wire useable in automobile technology and automation application for transporting data and/or signals and having an electric shield layer efficient to prevent different obstacles is provided. CONSTITUTION: The electric wire comprises at least two mutually insulated conductors(4) embedded in a common internal covering(6) having a cylindrical outside surface with accurate dimensions. On the internal covering(6) there is disposed a braided electric shield(14) on which an outside protection layer(15) consisting of an insulating material is disposed. To provide a simple construction of the electric wire(1), the mutually insulated conductors(4) are twisted together in an alternating twisting direction. The internal covering(6) is made of a mechanically stable but compressible insulating material. The protection layer(15) is composed of the first film molded around the shield(14) while entering longitudinally and the second film spirally wound around the first film.

Description

Wire {ELECTRIC LINE}

The present invention has at least two conductors inserted into a common inner wall having a precise cylindrical outer surface and insulated from each other, the inner wall of which comprises an electrical shielding layer configured as a braid and an outer material consisting of an insulating material over the shielding layer. It relates to a wire in which a protective layer is arranged (German Patent No. 298 08 657).

This type of wire is used for data or signal transmission, for example in the fields of industrial automation and automotive technology. It is simple to manufacture and reliable and has the lightest weight possible. In such wires, an electrical shielding layer is provided that is effective in preventing interference. In addition, the sheath or insulation should be removed as simply as possible for the connection.

The wire known from German Patent No. 298 08 657, mentioned above, fulfills these requirements. The electric wire is composed of electrical wires arranged side by side surrounded by a lapping, which is provided with two differently colored insulating layers and represented by a separating layer. On the separation layer is arranged an inner wall formed by extrusion molding and composed of polyvinylcloroid. As a mechanical protector, an outer shell composed of polyvinylcloroid is provided. The cost for the manufacture of such wires is quite expensive. In particular, this applies in the production of cores composed of element wires and separation layers. In addition, the separation layer must be segregated separately for contact.

It is an object of the present invention to simply manufacture the wires described above and to simply remove the sheath of the wires.

According to the invention, this object is

The conductors insulated against each other are stranded in a repeating direction of lay,

-The inner wall is composed of mechanically strong but compressible insulating material,

The protective layer is solved by being composed of a first foil formed in a longitudinal direction around the shielding layer and a second foil helically wrapping around the first foil.

The wires can be manufactured to the required precision in a single process. Since the conductors are stranded with each other in the repeated layer direction, maintained at an insulating interval, there is no need for a stranded wire holder provided with a spool rotating only in one direction. The inner wall, which acts as a coating layer by compressible practice, can simply be formed around the stranded conductor at a rate that remains the same in the twisted pair process. This also applies to "shielding layers" and "protective layers" which are applied successively during the tandem process. The wires are used directly without any additional measures after the stripping is carried out for the contact, since they can be removed directly from the conductor after the inner wall is cut.

1 is a side schematic view of wire elements stranded together in a repeating layer direction;

Figure 2 is an enlarged cross-sectional view of the wire according to the present invention.

3 and 4 differently show each element of FIG.

5 through 8 are cross-sectional views of another embodiment of FIG.

<Explanation of symbols for the main parts of the drawings>

1: wire

2, 3: wire

4: conductor

5: insulation layer

6: inner wall

7: band

13: shielding foil

14: shielding layer

15: protective layer

16, 17: insertion line

22, 23: conductor

Embodiments of the subject matter of the present invention are shown in the drawings.

1 is a schematic side view of a core of an electric wire having two stranded wire elements E stranded together in a repeating layer direction. This type of twisted pair is referred to in the art as "SZ-stranded". In the extension of the electric wire L, the twisting direction with respect to the stranded wire element E is changed at each switching position U, one of which is shown in FIG. There is no need for a prior art twisted pair device that twists in only one direction to produce this type of wire and that the number of spools must be provided to correspond to the number of elements twisted.

According to the invention, the wire 1 has the following exemplary configuration in accordance with FIG.

In the center of the wire 1 are arranged two strands 2, 3 stranded together in an SZ-process. The element wires 2 and 3 are each composed of a conductor 4 and an insulating layer 5 surrounding the conductor. The conductor 4 is comprised preferably from copper. Copper wire can be more rigid than iron wire or litz wire. In the preferred embodiment, a forming material is used as the insulating layer 5. In addition, the insulating layer can be firmly completed. Both wires 2 and 3 are provided with insulating layers 5 which are colored differently. As the insulating material, for example, polyethylene and polypropylene are suitable.

Element wires 2 and 3 are manufactured with high precision. The element wire is set precisely over its entire length and has the same outer diameter. After the SZ-stranded wire, the element wire has a height H corresponding to two outer diameters. The height H corresponds to the diameter of the indicated circle K (viewed in the longitudinal direction) provided equally at each position of the wire 1.

Around the element wires 2 and 3, an inner wall 6 supported by the element wires 2 and 3 and made of an insulating material is formed, an insert is filled between the element wires, and the inner wall is a circular outer having a selected radius R. Has a surface. The distance of the outer surface of the inner wall 6 from the circle K is made of a mechanically rigid but compressible material, for example foamed polyethylene, polypropylene or silicone. The inner wall can be formed on both strands 2 and 3 using extrusion molding.

In a preferred embodiment, the inner wall 6 is made from a band 7 of foaming material based on the polyurethane shown in Fig. 3, which band extends in the longitudinal direction (Fig. 4). Bent to surround both element wires (2, 3).

The band 7 consists of a rectangular strip 9 of forming material provided on the support foil 10. The support foil 10 protrudes to form the joining plate 11 over the entire length of the band 7 on one side. The band 7 is formed longitudinally with respect to the open seam tube 8 to form the inner wall 6, so that the edges on both sides of the band contact each other at the cutout 12. The bonding plate 11 protrudes through the shim 12. The bonding plate is placed in the support foil 10 in the final state and can be bonded to the support foil. The shape of the open shim has a fairly high precision and dimensions that remain the same over the entire length. The forming material of the strip 9 is partially compressed through the element wires 2, 3. However, the forming material does not form a gap in the insert between both wires 2 and 3.

The inner wall 6 of the electric wire 1 shown in FIG. 2 is provided with a shielding foil 13 which extends in the longitudinal direction and is formed around the inner wall 6 with overlapping edges. Such shielding foil may be glued to the inner wall. The shielding foil 13 is surrounded by a shielding layer 14 configured as braided wire that is electrically well conducted. The shielding layer 14 is provided with an outer protective layer 15 consisting of a first foil with longitudinally extending and overlapping edges arranged and a second foil spirally surrounding the first foil with an overlap. The shielding foil 13 can be removed by sufficiently dense implementation of braiding for the shielding layer 14. If the shielding foil 13 is used, for example, an aluminum band coated with a dissolving adhesive may be disposed on one side. The melt adhesive is activated by heat supply to bond the shielding foil 13 to the inner wall 6, thereby making the inner wall more rigid.

Both foils of the protective layer 15 are made of ash, for example based on polyester. On one side of both foils is coated with an adhesive which acts upon heat supply. Suitable adhesives are, for example, polymer based materials and soluble adhesives. The adhesive layer is provided on the outer side in the first foil and on the inner side in the second foil. On the one hand, at the time of heat supply, the overlapping regions of both foils are bonded to each other, and on the other hand, both foils are bonded to each other to form a protective layer 15 which is firmly attached to each other.

The dimensions of the wire 1 in the configuration according to FIG. 2 are so accurate that the coating can be removed in a single process, for example by means of the apparatus disclosed in German patent 195 43 390. The knife of the device is inserted up to the circle K of the layers of the wire 1. After the layers have been rotated 360 degrees the remainder of the inner wall 6 can be pulled from the element wires 2, 3.

According to FIG. 5 in addition to the embodiment according to FIG. 2, the electric wire 1 is in addition to the two element wires 2, 3, with an additional insertion line made of plastic disposed in the insert of both element wires 2, 3. 16, 17). The insertion line is preferably composed of foaming material, in particular foamed polyethylene or polypropylene. The insertion lines 16 and 17 are stranded together with the element wires 2 and 3 through the SZ process. The other configuration of the electric wire 1 according to FIG. 5 is the same as the electric wire 1 according to FIG. 2.

This principle also applies to the wire 1 according to FIG. 6. In the embodiment of FIG. 6, the four element wires 18, 19, 20, 21 are twisted together by the SZ-process. Four wires are provided with an insulating layer 5 of different colors.

In the electric wire 1 according to Figs. 7 and 8, bare conductors, which can be embodied again as electric wires or litz wires, are disposed instead of element wires, respectively.

In the wire 1 according to FIG. 7, the two conductors 22, 23 are stranded by the SZ process with two insertion lines 24, 25 made of plastic. The diameters of the insertion lines 24 and 25 are larger than the conductors 22 and 23. The insertion wires are in contact with each other so that the conductors 22, 23 are insulated from each other at sufficient intervals in the inserts of the insertion wires. The dimensions of the insertion lines 24, 25 are carried out very accurately. Both insertion lines have the same diameter. The common height of the insertion lines determines the diameter of the circle K in the embodiment of the wire 1. The insertion lines 24 and 25 are colored in different colors to distinguish the conductors 22 and 23. The insertion lines are preferably composed of forming material.

In the embodiment of the wire 1 according to FIG. 8, the four bare conductors 26, 27, 28, 29 are likewise made of plastic, with four insertion lines 30, 31, 32, 33 made of plastic. Is wrapped around the core 34 of. The conductor and the insertion line are twisted and wrapped around the core 34 with each other by the SZ-process.

The configuration of the wire 1, provided via conductors and insertion lines according to FIGS. 7 and 8, corresponds to the configuration of the wire 1 according to FIG. 2. The electric wire 1 has at least two conductors or element wires. In a preferred embodiment, it may be two or four conductors to element wires.

The inner wall according to the invention provides a wire which is simply manufacturable and reliable, has the lightest weight possible and is simple in use, where the sheath or insulation is removed.

Claims (5)

A wire having at least two conductors inserted into a common inner wall having a precise cylindrical outer surface and insulated from each other, the inner wall of which is arranged with an electrical shielding layer configured as a braid and an outer protective layer of insulating material on the shielding layer. To Conductors insulated against each other are stranded together in a repeating layer direction, The inner wall 6 is made of mechanically rigid but compressible insulating material, And wherein the protective layer (15) comprises a first foil formed in a longitudinal direction around the shielding layer (14) and a second foil helically surrounding the first foil. The conductor of claim 1, wherein the conductor comprises stranded strands and is stranded in a repeating layer direction with at least two differently colored plastic inserting lines, the conductor being spaced through the insertion line acting as a spacing part. Wire made. The electric wire according to claim 1, wherein the conductor as the element wire is surrounded by an insulation layer, and the insulation layer of the individual element wires is colored in a different color. 4. The inner wall (6) according to any one of the preceding claims, wherein the inner wall (6) extends longitudinally with respect to the open seam tube (8) facing each other and with a blunt edge, consisting of a band surrounding the conductors. Characterized in that the wire. The electric wire according to any one of claims 1 to 5, wherein both foils of the protective layer (15) are bonded to each other.